Eevee evolves at night into umbreon. You don't give it stones.you have to make its happiness to the max. Here are all the following things to do so: [1] go to the hair cut salon in goldenrod city underground NOTE: You can only get haircuts once a day [2] give it a sooth bell [3] just plain old walk with it and [4] give it protein,carbos,irons etc. You can find those at the goldenrod city department store NOTE: These are not step by step ,these are just different ways to do it.hoped I helped :]
You don't use a stone. It will not work. You need to raise the evee's friendship level to the max, then level it up. You can look this info up just about anywhere there is pokemon information, like serebii.net (which has very current info in it's pokedex). You can boost the evee's happiness by givng it haricuts in Goldenrod City, walking around with it, battling with it, having it hold the soothe bell that you can find in the National Park, giving it calciums (etc), and plain old giving it time.
Well I just evolved my eevee into a umbreon and you should give eevee a soothe bell, haircuts and keep talking to it but heres a tip do it in the night time because if you dint it will evolve into another pokemon
Eevee needs to happy and it needs to be night time.
You have to make its friendship high enough while it is night time in the game.
Not true you must train it at night
You don't use stones!!! You try to evolve it at night
Use a dark sphere from mount cornet when it evolves it will be shiny
Train it up at night and give it a dusk stone to hold or a soothe bell
You need a dark stone. Because my brother gave me a moon stone and it didn't work
Dark or moon stone one of em
I don't know how to get an Umbreon. I got an Espeon while having it hold a Dawn stone while it was at a high level (30 or so) and leveling it up in the day time. I'm guessing it's the same for an Umbreon, but having it hold a Dusk stone and leveling it up in night time while it's at a high level. I've seen reports saying 'get its happy to the max' so I'd use that, too.